/Engine/Plugins/Editor/UVEditor/Source/UVEditorTools/Public/ToolTargets/UVEditorToolMeshInput.h
Updates UnwrapPreview UV Overlay from UnwrapPreview vert positions. Issues a NotifyDeferredEditCompleted for both positions and UVs.
void UpdateUnwrapPreviewOverlayFromPositions ( const [TArray](API\Runtime\Core\Containers\TArray)< int32 > * ChangedVids, const [TArray](API\Runtime\Core\Containers\TArray)< int32 > * ChangedConnectivityTids, const [TArray](API\Runtime\Core\Containers\TArray)< int32 > * FastRenderUpdateTids )